The Hustler Spindle Assembly (OEM Part Numbers 125981 and 605380) is a genuine replacement part designed for Hustler FasTrak and FasTrak SD mowers. This heavy-duty spindle connects the mower blades to the deck, enabling consistent and efficient cutting performance.
Made from durable materials and built to factory specifications, this spindle assembly suits 48″, 54″, and 60″ decks across FasTrak SD and SDX models. It features a 12-point spline shaft, sealed bearings, and a robust housing designed to withstand the rigours of regular mowing. The part has been superseded from 605380 to 125981, ensuring compatibility with updated Hustler models.
This spindle is ideal for users seeking OEM reliability and fitment. It helps prevent vibration, uneven cuts, and premature wear, making it a critical component for maintaining deck integrity and blade performance.

Technical Specifications:

• OEM Part Numbers: 125981, 605380
• Fits Deck Sizes: 48″, 54″, 60″
• Shaft Type: 12-point spline
• Thread (Pulley End): 1/2 – 13 UNC
• Thread (Blade End): 5/8 – 11 UNC
• Material: Cast Aluminium Housing
• Includes: Bearings, shaft, mounting base